Trying to make some money but don't know where to find past auction prices

[Ninjamohawk]

I'm completely green at this but is there a way to check and see what a reasonable price would be for the following items:

Tactics Ogre Tarot Cards from Square Enix
Shin Megami Tensei Nocturne, Makai Kingdom, and Phantom Brave Double jump guides
Club Nintendo 2011 platinum member reward pin set (wrapped)
Nintendo branded mario-themed hanafuda card deck in case
3DS Ambassador system with all ambassador games downloaded

got some other stuff I want to unload too but these are the main ones. I see a really huge array of prices on Ebay and I'm confused as to where I can find solid values. I don't want to get screwed. I really need the money.

[Enmity]

all of those can be found on ebay easily by just clicking on the sold tab during a search.


Edit: The ebay sold prices are your solid prices you either just have to pick an average and go with it, or list it as an auction and let people pay what they want.